Abstract

This paper describes, summarizes, and compares the properties of three photoelectric devices, namely: point contact phototransistors, <i>p-n</i> junction phototransistors, and <i>n-p-n</i> junction multiplier phototransistors, which have resulted from the prosecution of the transistor program at the Bell Telephone Laboratories. The first of these devices is characterized by a comparatively high dark current and a quantum yield of 3 or 4 electrons per quantum. The second has a dark current in the microampere range and a quantum yield of approximately unity. The <i>n-p-n</i> device has a sensitivity corresponding at best to a quantum yield of several hundred electrons per quantum. All these devices have long-wave thresholds around 1.8 microns. The structures lend themselves readily to miniature encapsulation.

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